Fig. 1. Topographic and three-dimensional atomic force microscopic images of the coatings. Titanium: untreated titanium disk, Col: collagen-coated titanium surface, Col/BMP-2: collagen/bone morphogenetic protein-2 (BMP-2)-coated titanium surface, Col/nHAp/BMP-2: collagen/nano-hydroxyapatite/BMP-2-coated titanium surface. (RMS: root mean square)
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